Using a real number is fine if you are actually confident it is right.
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Sometimes I happen to know an actual market statistic from school or work. Should I use that number, or is it better to build an estimate from assumptions so the interviewer can see my reasoning?
Using a real number is fine if you are actually confident it is right.
Would you tell the interviewer where you remember the statistic from?
I am practicing a B2B market where a handful of large customers buy much more than everyone else. A simple average per customer feels misleading. How should I segment it?
Mayank G.CoachSegment customers by a driver that meaningfully changes demand rather than relying on one average.
In market sizing I often know the structure I want, but I do not know a basic input like the population of the country. Should I ask for it, make an assumption, or switch to a different approach?
Mayank G.CoachAsk for the input if it is a reasonable fact the interviewer may be willing to provide. If they do not provide it, state a sensible assumption and continue rather than getting stuck on recall.
For some market-sizing questions I can see both a customer-demand approach and a supply/capacity approach. How do I decide which one to use in the interview?
Mayank G.CoachChoose the approach that uses the most reliable assumptions and connects most directly to the market you are sizing.